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