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