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