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