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