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