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