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