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