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