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