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