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