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