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