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