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