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