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