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