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