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