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