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