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)(19,25,27,20)(22,24,29,30)(26,28,32,31)(1,3,5,4)(2,6,7,8)(9,11,13,12)(10,14,15,16)(17,18)(19,26)(20,28)(21,23)(22,30)(24,29)(25,31)(27,32)(9,12,13,11)(10,14,15,16)(17,19,21,27)(18,20,23,25)(22,31,29,28)(24,32,30,26)(1,4,5,3)(2,6,7,8)(17,20,21,25)(18,19,23,27)(22,32,29,26)(24,31,30,28)(18,23)(19,27)(24,30)(28,31) 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.