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