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