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