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