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