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