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