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