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