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