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