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