One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,16)(12,14)(13,15)(17,18)(19,23)(20,25)(21,31)(22,27)(24,28)(26,29)(30,32) involution — undirected(1,3)(2,5)(4,8)(6,7)(17,19,22,28)(18,23,27,24)(20,21,30,29)(25,31,32,26)(9,11,13,12)(10,14,15,16)(17,19,20,29,22,28,30,21)(18,24,25,31,27,23,32,26)(2,6)(5,7)(17,20,22,30)(18,25,27,32)(19,21,28,29)(23,31,24,26)(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,21,20,19,22,29,30,28)(18,26,25,24,27,31,32,23)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.