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