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