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