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