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