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