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