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