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