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