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