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