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