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