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