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