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)(17,18,20,23)(19,22,27,24)(21,25,29,32)(26,31,28,30)(2,6)(7,8)(17,19)(18,22)(20,27)(21,26)(23,24)(25,31)(28,29)(30,32) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(18,23)(19,26)(21,29)(22,30)(24,31)(27,28)(1,3,5,4)(2,7,6,8)(17,19)(18,24)(20,27)(21,26)(22,23)(25,30)(28,29)(31,32)(1,4,5,3)(2,8,6,7)(19,26)(21,29)(22,31)(24,30)(25,32)(27,28)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.