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