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