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