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