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