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