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