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