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)(13,14,20,28,19,23,18,17)(15,22,27,21,16,26,25,24)(5,6)(7,11)(8,10)(9,12)(13,15)(14,21)(16,19)(17,26)(18,27)(20,25)(22,28)(23,24) involution — undirected(2,4)(5,7)(6,9)(8,12)(10,11)(13,16,19,15)(14,22,23,26)(17,24,28,21)(18,27,20,25)(7,12)(9,11)(13,17,20,14,19,28,18,23)(15,24,27,22,16,21,25,26)(6,10)(9,11)(14,23)(15,16)(17,28)(25,27) 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.