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