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