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