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