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)(17,18,22,28,23,29,21,27)(19,24,20,32,31,25,30,26)(1,2)(3,4)(9,11)(10,13)(12,16)(14,15)(17,19,22,20,23,31,21,30)(18,24,28,32,29,25,27,26)(2,4)(9,11)(10,14)(12,16)(13,15)(17,20)(18,25)(19,22)(21,31)(23,30)(24,29)(26,27)(28,32) involution — undirected(6,8)(11,16)(13,14)(17,19,23,31)(18,26,29,32)(20,22,30,21)(24,28,25,27)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.