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