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