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