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