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