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