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