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