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