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