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