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