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