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