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