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