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