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