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