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