I have tried this with my children today so I know it works.
You will need to colour in some stickers and put them on the keys like this, best to use an old keyboard like we did.
Use the black keys to work out where you are.
You will also need to listen to the song on youtube to work out how it goes.
Here is the music with colours to match the keyboard, the top line is for your right hand and the next line down for your left hand. The words are underneath the music. Watch out for the F note the third one from the end it should be played F# instead which means the black key to the right of the F key.
In a cavern, In a canyon,
Excavating for a mine,
Dwelt a miner forty-niner,
And his daughter Clementine.
Oh my darling, Oh my darling,
Oh my darling Clementine,
You are lost and gone forever,
Dreadful sorry Clementine.
Light she was and like a fairy,
And her shoes were number nine;
Herring boxes, without topses,
Sandals were for Clementine.
Drove she ducklings to the water,
Every morning just at nine;
Hit her foot against a splinter,
Fell into the foaming brine.
Ruby lips above the water,
Blowing bubbles, soft and fine;
But Alas! I was no swimmer,
So I lost my Clementine.
When the miner forty-niner,
Soon began to peak and pine,
Thought he oughter "jine" his daughter,
Now he's with his clementine.
In a corner of the churchyard,
Where the myrtle boughs entwine,
Grow the roses in their poses,
Fertilized by Clementine.
In my dreams she still doth haunt me,
Robed in garments soaked in brine.
Though in life I used to hug her,
Now she's dead, I'll draw the line.
How I missed her, how I missed her
How I missed my Clementine.
So I kissed her little sister,
And forgot my Clementine.
The better way really is to colour it in yourself, here is a blank one to colour in.
Even better would be to write it all out yourself like I did.
The colours will also work on a stickered guitar, click on the link for it http://thanetonline.blogspot.co.uk/2014/08/where-notes-are-on-guitars-and.html
You could even do what I did and start with a blank sheet of paper