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)(12,15)(13,16)(17,21)(18,22)(19,23)(20,24)(25,26)(27,35)(28,32)(29,33)(30,39)(31,34)(36,38)(37,40)(9,11)(10,14)(12,19)(13,17)(15,23)(16,21)(18,20)(22,24)(25,27,28,37,31,36,30,33)(26,29,39,38,34,40,32,35)(2,5)(6,8)(11,17)(14,21)(18,19)(22,23)(25,28,31,30)(26,32,34,39)(27,33,36,37)(29,38,40,35)(9,12,13,20)(10,15,16,24)(11,18,17,19)(14,22,21,23)(25,29,31,40)(26,33,34,37)(27,32,36,39)(28,38,30,35)(1,3,4,7)(2,6,5,8)(10,16)(14,21)(15,24)(22,23)(26,34)(29,40)(32,39)(35,38)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.