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