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