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