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