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