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