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