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