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