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