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