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