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