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