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