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