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