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