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