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