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