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