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