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)(13,14,18,17)(15,20,16,19)(22,26)(24,27)(1,2,4,3)(5,7,8,12)(6,9,10,11)(13,15,18,16)(14,19,17,20)(22,26)(23,28)(6,10)(9,11)(13,15,18,16)(14,20,17,19)(21,22,25,26)(23,27,28,24)(1,3,4,2)(5,7)(6,9)(8,12)(10,11)(13,16,18,15)(14,20,17,19)(21,23)(22,27)(24,26)(25,28)(5,6)(7,9)(8,10)(11,12)(13,17,18,14)(15,20,16,19)(21,24,25,27)(22,23,26,28)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.