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