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