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