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