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