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