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