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