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