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