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