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