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