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