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