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