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