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