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