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