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