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