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