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