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