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