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