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