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)(13,14,18,15,17,21,19,23)(16,20,25,22,24,27,26,28)(5,7)(6,9)(8,12)(10,11)(13,15,18,21,17,23,19,14)(16,22,25,27,24,28,26,20)(1,2,3,4)(13,14,19,23,17,21,18,15)(16,20,26,28,24,27,25,22)(7,12)(9,11)(13,16)(14,20)(15,22)(17,24)(18,25)(19,26)(21,27)(23,28) involution — undirected(6,10)(9,11)(16,24)(20,27)(22,28)(25,26) 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.