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