One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(6,8)(11,15)(13,16)(17,18)(19,20)(21,29)(22,23)(24,27)(25,31)(26,32)(28,30) involution — undirected(9,10,12,14)(11,13,15,16)(18,23)(20,27)(25,29)(28,32)(5,6)(7,8)(9,10)(11,13)(12,14)(15,16)(17,19,22,24)(18,20,23,27)(21,30,31,26)(25,32,29,28)(1,2,3,4)(9,11)(10,13)(12,15)(14,16)(17,20)(18,24)(19,23)(21,28)(22,27)(25,30)(26,29)(31,32)(17,21,22,31)(18,25,23,29)(19,26,24,30)(20,28,27,32)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.