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