One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,4,7,6)(9,10)(11,15)(12,13)(14,16)(17,18)(19,27)(20,29)(21,25)(22,23)(24,26)(28,30)(31,32)(1,3)(2,6)(4,8)(5,7)(10,13)(14,15)(17,19,24,23)(18,22,26,27)(20,28,21,31)(25,30,29,32)(9,10)(11,14)(12,13)(15,16)(17,20,24,21)(18,25,26,29)(19,28,23,31)(22,30,27,32)(1,3)(2,4)(5,7)(6,8)(9,11,12,16)(10,14,13,15)(17,21,24,20)(18,25,26,29)(19,28,23,31)(22,32,27,30)(1,3)(2,4)(5,7)(6,8)(17,22,24,27)(18,19,26,23)(20,30,21,32)(25,28,29,31)(1,4)(2,7)(3,8)(5,6)(17,23,24,19)(18,22,26,27)(20,31,21,28)(25,30,29,32)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.