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