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