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