This is a Cuboctahedron cube as seen at http://www.twistypuzzles.com/ :
Colors of the diamond shaped faces:
Yellow is opposite white, blue opposite green, and orange opposite red.
If the blue side is on the top, then the red side is on the front and the yellow side on the right.
Colors of the triangular faces:
Top triangles in clockwise order starting with the triangle between yellow and red: light rose, gray, deep pink, light violet.
Bottom triangles in clockwise order starting with the triangle between red and yellow: red violet, light green, gold, cyan.
Werner Randelshofer 2010