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