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