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