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