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