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