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