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