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