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)(13,14,19,23)(15,20,18,27)(16,25,17,22)(21,26,28,24)(5,7)(6,9)(8,12)(10,11)(13,15,19,18)(14,20,23,27)(16,26,17,24)(21,25,28,22)(7,12)(9,11)(13,16,19,17)(14,21,23,28)(15,24,18,26)(20,22,27,25)(6,10)(9,11)(13,17,19,16)(14,22,23,25)(15,24,18,26)(20,21,27,28)(1,3,4,2)(13,15,19,18)(14,20,23,27)(16,24,17,26)(21,22,28,25)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.