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