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)(25,26,31,35)(27,32,28,37)(29,34,30,39)(33,36,40,38)(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)(26,32,35,37)(29,38,30,36)(33,39,40,34)(9,12,14,13)(10,16,18,17)(11,19,21,20)(15,22,24,23)(25,28,31,27)(26,33,35,40)(29,38,30,36)(32,39,37,34)(2,5)(6,7)(9,13,14,12)(10,17,18,16)(11,20,21,19)(15,23,24,22)(1,3,4,8)(2,6,5,7)(10,18)(15,24)(16,17)(22,23)(25,29,31,30)(26,34,35,39)(27,36,28,38)(32,40,37,33)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.