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