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