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