One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(11,12)(15,16)(18,23)(21,24)(25,26,28,30)(27,29,31,32)(1,3,5,8)(2,4,6,7)(9,10,14,13)(11,16,12,15)(17,18,22,23)(19,24,20,21)(27,31)(29,32)(2,6)(4,7)(9,11,14,12)(10,15,13,16)(17,19,22,20)(18,21,23,24)(25,27,28,31)(26,29,30,32)(1,3)(2,7)(4,6)(5,8)(9,12,14,11)(10,16,13,15)(17,20,22,19)(18,21,23,24)(25,26)(27,29)(28,30)(31,32)(1,4,5,7)(2,3,6,8)(9,13,14,10)(11,16,12,15)(17,21)(18,19)(20,23)(22,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.