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