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