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