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