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