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