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)(3,6)(4,5)(7,8)(17,18,22,24)(19,25,26,27)(20,21,29,30)(23,31,32,28)(9,11,13,12)(10,14,15,16)(17,19,21,28,22,26,30,31)(18,23,20,25,24,32,29,27)(1,3,4,7)(2,6,5,8)(19,26)(23,32)(25,27)(28,31)(2,5)(6,8)(9,12,13,11)(10,14,15,16)(17,20,21,24,22,29,30,18)(19,27,28,23,26,25,31,32)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.