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