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