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