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