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