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