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