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