Symmetry Group of a Colored Cube

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What is the proper symmetry group of a cube in which three faces where none are opposite each other are painted yellow and the other faces are blue?

Any idea on where to start

Thank you

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For me it is easier to think of blue tetrahedron and a yellow tetrahedron glued together along one face. The symmetry group then is just the symmetry group of the tetrahedron, with one face mapped to itself: there is rotation of period 3 (on an axis perpendicular to the fixed face), and a flip (about a plane perpendicular to the fixed face). The dihedral group of triangle.