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