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