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