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)(11,12)(13,16)(14,17)(15,18)(19,20)(21,22)(23,24)(25,26)(27,29)(28,32)(30,33)(31,34)(35,37)(36,38)(39,40)(1,2,4,6)(3,5,8,7)(9,11)(10,12)(13,19)(14,15)(16,20)(17,18)(21,24)(22,23)(25,27)(26,28)(29,34)(30,35)(31,32)(33,36)(37,40)(38,39)(1,2)(3,5)(4,6)(7,8)(9,10)(11,18)(12,15)(13,16)(14,17)(19,24)(20,23)(21,22)(25,28,31,29)(26,32,34,27)(30,36,39,37)(33,38,40,35)(3,8)(5,7)(9,10)(11,12)(13,21)(14,17)(15,18)(16,22)(19,24)(20,23)(25,27)(26,28)(29,34)(30,38)(31,32)(33,37)(35,39)(36,40) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,12)(10,15)(11,17)(13,20)(14,18)(16,23)(19,21)(22,24)(25,29,31,28)(26,32,34,27)(30,37,39,36)(33,38,40,35)(1,3)(2,5)(4,8)(6,7)(9,13)(10,16)(11,19)(12,20)(14,22)(15,23)(17,21)(18,24)(25,30)(26,33)(27,35)(28,36)(29,37)(31,39)(32,38)(34,40) 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.