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