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