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