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