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