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