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