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