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