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