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