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