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