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