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