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