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)(13,14,18,15)(16,23,26,20)(17,21,27,24)(19,22,28,25)(5,7,9,8)(6,10,11,12)(13,15,18,14)(16,24,26,21)(17,20,27,23)(19,22,28,25)(1,2,3,4)(13,16)(14,20)(15,23)(17,19)(18,26)(21,25)(22,24)(27,28)(5,8,9,7)(6,10,11,12)(16,17)(19,28)(20,24)(21,23)(22,25)(26,27)(13,17,18,27)(14,21,15,24)(16,19,26,28)(20,25,23,22)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.