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