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