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