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