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