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