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