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