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