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