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