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