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