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