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