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