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