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)(11,14)(12,13)(15,16)(17,18)(19,27)(20,25)(21,23)(22,26)(24,29)(28,31)(30,32)(10,13)(14,16)(18,23)(19,28)(20,22)(24,27)(29,30)(31,32) involution — undirected(2,4)(11,15)(14,16)(17,19,21,30)(18,24,23,31)(20,28,22,29)(25,27,26,32)(9,11,12,15)(10,14,13,16)(17,20,21,22)(18,25,23,26)(19,29,30,28)(24,32,31,27)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.