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