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