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