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