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