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