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