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