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