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