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