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