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