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