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