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