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