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