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