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