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