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