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