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