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