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