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