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