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