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