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