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