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