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