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