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