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