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