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)(11,17)(12,21)(13,24)(14,18)(15,16)(19,23)(20,22)(25,26,30,35)(27,32,36,31)(28,33,39,38)(29,34,40,37)(1,3,4,7)(2,5,6,8)(10,16)(13,18)(17,21)(19,22)(27,36)(28,39)(31,32)(33,38)(1,2)(3,5)(4,6)(7,8)(9,11,15,12)(10,17,16,21)(13,19,18,22)(14,20,24,23)(25,27)(26,31)(28,37)(29,38)(30,36)(32,35)(33,40)(34,39)(1,3)(2,5)(4,7)(6,8)(9,12,15,11)(10,17,16,21)(13,22,18,19)(14,20,24,23)(25,27)(26,32)(28,37)(29,33)(30,36)(31,35)(34,39)(38,40)(1,2)(3,5)(4,6)(7,8)(9,13,15,18)(10,14,16,24)(11,19,12,22)(17,20,21,23)(25,28)(26,33)(27,37)(29,32)(30,39)(31,40)(34,36)(35,38)(9,14)(10,18)(11,20)(12,23)(13,16)(15,24)(17,22)(19,21)(25,29)(26,34)(27,38)(28,32)(30,40)(31,39)(33,36)(35,37) 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.