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