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