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