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