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