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