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