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