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