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