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