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