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