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