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