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