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