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)(19,29)(20,31)(21,26)(22,27)(23,32)(24,28)(25,30) involution — undirected(9,10)(11,15)(12,13)(14,16)(17,19,24,21)(18,25,28,31)(20,22,30,23)(26,32,29,27)(2,5)(6,8)(10,13)(14,15)(17,20,24,30)(18,25,28,31)(19,22,21,23)(26,27,29,32)(9,11,12,16)(10,14,13,15)(17,21,24,19)(18,26,28,29)(20,22,30,23)(25,32,31,27)(1,3,4,7)(2,6,5,8)(17,22,24,23)(18,27,28,32)(19,30,21,20)(25,26,31,29)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.