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