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