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