One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,14,17)(11,15,19,23)(12,21,16,13)(18,20,22,24)(25,26,29,32)(27,30,34,39)(28,36,37,31)(33,40,35,38)(1,3,4,8)(2,5,6,7)(9,11,14,19)(10,15,17,23)(12,22,16,18)(13,20,21,24)(25,27,29,34)(26,30,32,39)(28,33,37,35)(31,38,36,40)(9,12,13,10,14,16,21,17)(11,18,20,23,19,22,24,15)(27,33,34,35)(30,38,39,40)(2,6)(5,7)(11,19)(15,23)(18,22)(20,24) involution — undirectedA 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.