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