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)(27,33)(28,34)(29,30)(31,32)(35,38)(36,37)(39,40)(3,7)(5,8)(9,10)(11,15)(12,19)(13,14)(16,21)(17,22)(18,24)(20,23)(26,32)(29,39)(33,34)(35,37) involution — undirected(1,2)(3,5)(4,6)(7,8)(10,14)(15,22)(16,19)(23,24)(25,27,31,28)(26,33,32,34)(29,35,39,37)(30,38,40,36)(9,11)(10,15)(12,20)(13,17)(14,22)(16,24)(18,21)(19,23)(25,28,31,27)(26,34,32,33)(29,35,39,37)(30,38,40,36)(1,3)(2,5)(4,7)(6,8)(9,12)(10,16)(11,18)(13,21)(14,19)(15,23)(17,20)(22,24)(25,29)(26,30)(27,35)(28,37)(31,39)(32,40)(33,38)(34,36) 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)(27,36)(28,38)(31,40)(32,39)(33,37)(34,35) 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.