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