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