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