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