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