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