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