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