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I can not reproduce it, on my installation i get:

sage: d = 3                                                                                                                                                                                                  
sage: g = graphs.CubeConnectedCycle(d)                                                                                                                                                                       
sage: g                                                                                                                                                                                                      
Cube-Connected Cycle of dimension 3: Graph on 24 vertices

It seems that this generator was introduced in Sage 9.1, see https://trac.sagemath.org/ticket/21423

Which version are you using ?