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