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