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