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