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