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