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