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