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