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