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