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