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