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