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