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