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)(11,19)(12,16)(13,17)(14,24)(15,18)(20,21)(22,23)(25,26,29,33)(27,31,35,30)(28,36,38,32)(34,39,37,40)(1,2,5,6)(3,7,8,4)(9,10)(11,19)(12,16)(13,14)(15,18)(17,24)(20,23)(21,22)(25,27,29,35)(26,30,33,31)(28,34,38,37)(32,39,36,40)(1,3)(2,4)(5,8)(6,7)(9,11,15,12)(10,16,18,19)(13,22,24,20)(14,23,17,21)(25,27,29,35)(26,30,33,31)(28,37,38,34)(32,40,36,39)(1,4)(2,3)(5,7)(6,8)(9,12,15,11)(10,16,18,19)(13,20,24,22)(14,23,17,21)(25,26)(27,30)(28,32)(29,33)(31,35)(34,39)(36,38)(37,40)(1,2)(3,4)(5,6)(7,8)(9,13)(10,17)(11,20)(12,22)(14,18)(15,24)(16,23)(19,21)(25,27)(26,31)(28,34)(29,35)(30,33)(32,40)(36,39)(37,38) involution — undirected(1,4)(2,3)(5,7)(6,8)(9,14,15,17)(10,13,18,24)(11,21,12,23)(16,20,19,22)(25,28)(26,32)(27,34)(29,38)(30,39)(31,40)(33,36)(35,37)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.