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