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