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