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