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