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