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