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