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