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