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