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)(13,14,18,17)(15,20,16,19)(21,22)(23,25)(24,26)(27,28)(5,7,9,8)(6,10,11,12)(14,17)(19,20)(21,22,24,26)(23,27,28,25)(13,15,18,16)(14,19,17,20)(21,22)(23,25)(24,26)(27,28)(1,2,3,4)(5,8,9,7)(6,10,11,12)(13,16,18,15)(14,20,17,19)(5,6)(7,12)(8,10)(9,11)(13,17,18,14)(15,20,16,19)(21,23,24,28)(22,25,26,27)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.