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