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