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