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