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