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