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