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