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