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