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