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