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