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