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