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