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