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