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