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