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