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)(19,27)(23,31)(24,32)(28,29)(2,5)(6,7)(9,11,13,10)(12,14,16,15)(17,18,21,26)(19,23,27,31)(20,25,22,30)(24,29,32,28)(9,12,13,16)(10,14,11,15)(17,19)(18,23)(20,29)(21,27)(22,28)(24,30)(25,32)(26,31)(10,11)(14,15)(17,19)(18,24)(20,28)(21,27)(22,29)(23,30)(25,31)(26,32) involution — undirected(1,3,4,8)(2,6,5,7)(17,20,21,22)(18,25,26,30)(19,28,27,29)(23,24,31,32)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.