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