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