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