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