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