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