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