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