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