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