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