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