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