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