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