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