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