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