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