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