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