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