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