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