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