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