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