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