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