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