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