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