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