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