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