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