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