This is the color arrangement of the original Rubik's cube as designed by Ernö Rubik:
Blue is opposite green, red opposite orange, and yellow is opposite to white.
If the blue side is on the top, then the red one is on the front and yellow on the right, and so on.
The white face of this virtual cube contains a replica of Ernö Rubik's signature, which he made in 1997 in London.