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