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