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