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