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