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