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