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