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