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