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