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