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