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