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)(13,14,18,23,19,22,28,17)(15,21,24,26,16,25,27,20)(5,6)(7,11)(8,10)(9,12)(13,15)(14,20)(16,19)(17,21)(18,27)(22,26)(23,25)(24,28) involution — undirected(1,2,3,4)(5,7)(6,9)(8,12)(10,11)(13,16,19,15)(14,21,22,25)(17,20,23,26)(18,27,28,24)(7,12)(9,11)(13,17,18,14,19,23,28,22)(15,20,24,21,16,26,27,25)(6,10)(9,11)(14,22)(15,16)(17,23)(24,27) 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.