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