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