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