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