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