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