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