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