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