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