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