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