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