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