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