How to change the color of the each phase of the cube separately ?

Hi, Everyone

I am creating a short game and I want to change the color of the each phase of the cube separately with mouse click.

Let me clear t$$anonymous$$s question bit more:

====> I want to assign the random color to the phase of the cube on w$$anonymous$$ch I clicked with mouse and want all the other phases with the default color as they were before. If any one know how to change the color of the clicked phase Kindly let me know. Your Advise will be Appreciated.

Thanks in Advance !!!!