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