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