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