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