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