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