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