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