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