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