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