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