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