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