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