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)(18,23)(24,29)(25,32)(26,31)(2,6)(7,8)(17,18)(19,25)(20,29)(21,23)(22,31)(24,28)(26,30)(27,32) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,19)(18,24)(20,22)(21,27)(23,29)(25,31)(26,32)(28,30)(1,4,5,3)(2,8,6,7)(18,23)(19,20)(22,30)(24,25)(27,28)(29,32)(17,20,21,28)(18,25,23,32)(19,22,27,30)(24,31,29,26)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.