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