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