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