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