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