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