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