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