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