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