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