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