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