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