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