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