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