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