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)(11,12)(13,16)(14,15)(17,18)(19,23)(20,30)(21,26)(22,27)(24,29)(25,31)(28,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,10)(11,12)(13,16)(14,15)(17,19,22,29)(18,23,27,24)(20,31,28,21)(25,32,26,30)(9,11,12,10,14,16,13,15)(17,20,31,19,22,28,21,29)(18,24,26,32,27,23,25,30)(2,6)(5,7)(9,12,14,13)(10,11,15,16)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.