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