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