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)(13,14,18,16)(15,20,17,19)(21,22,25,27)(23,24,26,28)(6,9)(10,12)(13,14,18,16)(15,19,17,20)(21,23)(22,24)(25,26)(27,28)(5,7,8,11)(6,10,9,12)(13,15,18,17)(14,19,16,20)(21,24)(22,26)(23,27)(25,28)(1,2,3,4)(5,7)(6,10)(8,11)(9,12)(13,16,18,14)(15,20,17,19)(5,6)(7,10)(8,9)(11,12)(13,17,18,15)(14,20,16,19)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.