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