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