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