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