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