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