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