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