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