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