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