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