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