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