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