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