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