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