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