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