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