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