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)(11,21,30,17,24,36,23,32)(12,18,28,26,29,35,27,34)(22,37,25,31,39,33,38,40)(9,11,15,24)(10,17,20,32)(12,25,29,38)(13,21,19,36)(14,30,16,23)(18,33,35,37)(22,27,39,28)(26,31,34,40)(1,2,3,4)(9,12)(10,18)(11,22)(13,26)(14,27)(15,29)(16,28)(17,31)(19,34)(20,35)(21,37)(23,38)(24,39)(25,30)(32,40)(33,36)(6,8)(9,13,16,20,15,19,14,10)(11,17,30,36,24,32,23,21)(12,26,28,35,29,34,27,18)(22,31,25,33,39,40,38,37)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.