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