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