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