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