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