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