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