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