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