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