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