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