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