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