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