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