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