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