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