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)(25,26,31,34)(27,29,33,30)(28,36,38,35)(32,39,40,37)(2,5)(6,8)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(25,27,30,26,31,33,29,34)(28,35,37,32,38,36,39,40)(1,3,4,7)(2,6,5,8)(9,12)(10,15)(11,17)(13,20)(14,21)(16,24)(18,19)(22,23)(25,28,30,37,31,38,29,39)(26,32,33,36,34,40,27,35)(12,20)(15,24)(17,19)(21,23)(25,29,31,30)(26,33,34,27)(28,37,38,39)(32,35,40,36)(11,18)(14,22)(17,19)(21,23)(28,38)(32,40)(35,36)(37,39) 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.