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