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