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