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