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