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