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