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