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