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