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