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