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