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